Update Does not Work in laravel 5.1

Hello I am doing a project called Doctor management. I want to do update my doctor profile into two different table called doctor & User table. But I can't do it. Please Help me. My Doctor Table

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateDoctorsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('doctors', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->integer('division_id');
            $table->integer('dcategory_id');
            $table->integer('district_id');
            $table->string('education');
            $table->string('hospital');
            $table->integer('fee');
            $table->integer('phone');
            $table->timestamps();
        });

    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('doctors');
    }
}

My User Table

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('username')->unique();
            $table->string('email')->unique();
            $table->string('password', 60);
            $table->rememberToken();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('users');
    }
}

My Controller is

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Http\Requests;
use App\Http\Controllers\Controller;
use DB;
use Auth;
class ProfileController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */

    public function index()
    {
        $profile = Auth::user();
        // if(!$profile) {
        //     return redirect()->route('logout')->with(['fail' => 'Profile Not Found']);
        // }
        return view('admin.article.index', compact('profile'));
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */

    public function getUpdate() {

        $profile = Auth::user();

        // $post = Post::find($post_id);
        // if(!$post) {
        //     return redirect()->route('blog.index')->with(['fail' => 'Post Not Found']);
        // }
        return view('admin.article.edit',['post' => $post]);
    }

    public function postUpdate(Request $request ) {

        $profile = Auth::user();


        $this->validate($request, [
            'name' => 'required|max:120',
            'username' => 'required|max:80',
            'email' => 'required',
            'password' => 'required'
            ]);

         // save users table
        $profile = Auth::user();
        // $user = new App\User;
        $profile->name = $request->input('name');
        $profile->email = $request->input('email');
        $profile->username = $request->input('username');
        $profile->password = $request->input('password');
        $profile->update();

        // save doctor table
        DB::table('doctor')
        ->update(
            'hospital'    =>  $profile->input('hospital'),
            'education'       =>  $profile->input('education')
        );  


        return redirect()->route('profile')->with(['success' => 'Profile Successfully Updated']);
    }

    // public function update(Request $request){
    //     $this->validate($request, [
    //         'name' => 'required|max:120',
    //         'username' => 'required|max:80',
    //         'email' => 'required',
    //         'password' => 'required'
    //         ]);

    //      // save users table
    //     $profile = Auth::user();
    //     // $user = new App\User;
    //     $profile->name = $request->input('name');
    //     $profile->email = $request->input('email');
    //     $profile->username = $request->input('username');
    //     $profile->password = $request->input('password');
    //     $profile->update();

    //     // save doctor table
    //     DB::table('doctor')
    //     ->update(
    //         'id'        =>  $profile->id,
    //         'gender'    =>  $profile->input('hospital'),
    //         'age'       =>  $profile->input('education')
    //     );  

    //     // set a flush message and redirect()->back();
    //     return TRUE;

    //     return redirect()->route('profile')->with(['success' => 'Profile Successfully Updated']);
    // }



    public function create()
    {
        //
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        //
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        //
    }
}

It did Not work Properly. Please help.Thanks in advance.

via Chebli Mohamed